opaque
/əuˈpeɪk; o`pek/ adj
1 not allowing light to pass through; not transparent 不透明的; 不透光的
opaque glass 不透明的玻璃
an opaque lens 不透光的镜片.
2 (of a statement, piece of writing, etc) not clear; difficult to understand （指言语、 写作等）不清晰的, 难懂的, 意义不明的
I felt his report was deliberately opaque. 我觉得他的报告故意含糊其辞.